9115681 has 4 divisors (see below), whose sum is σ = 9134100. Its totient is φ = 9097264.

The previous prime is 9115669. The next prime is 9115693. The reversal of 9115681 is 1865119.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (9115669) and next prime (9115693).

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 3312400 = 2409^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 9115681 - 2¹¹ = 9113633 is a prime.

It is a super-2 number, since 2×9115681² = 166191280187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9115181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8446 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (2283525).

Almost surely, 2^9115681 is an apocalyptic number.

It is an amenable number.

9115681 is a deficient number, since it is larger than the sum of its proper divisors (18419).

9115681 is a wasteful number, since it uses less digits than its factorization.

9115681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18418.

The product of its digits is 2160, while the sum is 31.

The square root of 9115681 is about 3019.2186075208. The cubic root of 9115681 is about 208.8957990375.

The spelling of 9115681 in words is "nine million, one hundred fifteen thousand, six hundred eighty-one".